#802 Require confirmation for user registration

Description of feature:
It would be great if the server could be made to require admin's confirmation whenever a user registers.
Possible implementation:
1. The admin would receive a message about the pending registration and then could take action by clicking a link (this would require collaboration with mod_http).
2. Another option would be for the admin to execute an ad-hoc command (mod_admin_ahoc), but this seems less preferable, as it needs client support, whereas a HTTP link can be clicked in (or copied out of) any client and opened in any web-browser.
Why?
This feature would allow me to allow people to register through any capable client by just giving them the server name, but I would still be in control who actually gets access. Another option to achieve the same effect would be through some one-time-token, which I can give to "authorised users" - but I assume this would require client support, just like CAPTCHAs do (XEP-0158).

Thanks for the hint! That indeed already solves my actual problem, though not through the in-band registration dialogue. I will try mod_invite together with my LDAP user backend and report whether I got it to work and how.